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                   Photo by Wm. Belnap, Jr.; 20.4a: © A. J. Copley/  Alamy; 21.9: © Bob Wallen; 21.12: © Frank M.   Parker/SPL/Photo Researchers; 23.22: © Bill W.
                   Visuals Unlimited; 20.4b: © L. Linkhart/Visuals   Hanna; 21.15: U.S. Geological Survey; 21.16a:   Tillery; 23.25: © Tom Brakefield/Getty; 23.26: ©
                   Unlimited; 20.5: © Ken Wagner/Visuals   © Albert J. Copley/Photodisc/Getty; 21.16b:   Photodisc Collection/Getty; 23.27: © Elizabeth
                   Unlimited; 20.6 (both): © Bill W. Tillery; 20.8:   © James L. Amos/Corbis; People Behind the   Wallen; 23.31: © Glen Allison/Getty Images;
                   © William J. Weber/Visuals Unlimited; 20.9:   Science, p. 534: Library of the Geological Survey   23.34: © Digital Vision/PunchStock; People
                   © Doug Sherman/Geofile; 20.11: © B. Amundson;   of Austria.             Behind the Science, p. 590: Courtesy of the
                   20.12a: © D. A. Rahm, photo courtesy of Rahm   Chapter 22  Opener: © Galen Rowell/  Mathematical Institute at the University of St.
                   Memorial Collections, Western Washington   Mountain Light Photography; 22.1, 22.16, 22.18   Andrews.
                   University; 20.13: © C. C. Plummer; People   (both), 22.19 (all): © Bill W. Tillery.   Chapter 24  Opener: © James H. Karales/Peter
                   Behind the Science, p. 514: © The Granger                               Arnold/Photolibrary; 24.1: Salt River Project;
                   Collection, NY; 20.16 (both): © Bill W. Tillery.  Chapter 23  Opener: © Charles Mayer/Science   24.9: City of Tempe, AZ; 24.10: Salt River Project;
                                                       Source/Photo Researchers; 23.1: © Peter Arnold/
                   Chapter 21  Opener: Courtesy Eldon Enger;   Peter Arnold/Photolibrary; 23.5, 23.7: © NOAA;   24.11, 24.14, 24.15: © Bill W. Tillery; 24.19:
                   21.1: © Andrew Gunners/Getty; 21.2: © Robert W.   23.8: © Rachel Epstein/PhotoEdit, Inc.; 23.17:   © John S. Shelton/University of Washington
                   Northrop, Photographer/Illustrator; 21.3:   © Dubuque Telegraph Herald/Photo by Patti   Libraries, Special Collections; People Behind the
                   © W. B. Saunders/Biological Photo Service; 21.4:   Carr; 23.18, 23.19 © NOAA; 23.21: © David   Science, p. 616: © Bettmann/Corbis.
                   © PhotoLink/Getty Images; 21.6: © B. A. E. Inc./


































































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